cover 10c Black (2), ample to large margins, trivial corner crease, tied by three strikes of red grid cancel on 1850 folded letter to Guelph, Canada West, Apr. 30 New York c.d.s. and May 2, 1850 Queenston U.C. transit marking, appropriate receiving backstamps, few file folds well clear of stamp, a fine and rare usagephoto est.